Dear Mark,

        On August 23 we have measured the force acting on the particle and
found that it is equal to the product B*dB*1.2e-15 [N]
        The steel particle weight is 4.57e-17 N.
http://stuff.quickfield.com/MarkArokiaraj/

        So with three coils we got the force 67 times the particle weight (10
cm away from the coils).
        Now I have simulated 5-coils configuration. Please see the picture
attached. The force is 386 times the particle weight.

=============
        Please note that this is 2D _plane_ simulation. In plane problem the
coils is represented by a pair of infinitely long bars. The field fades
as ~1/r. In accurate cylindrical problem the force fades as ~1/r*r.
        That leads to drastic discrepancies:  with plane model the computed
force (10 cm way from the coil) was 15 times higher that that with
axysimmetric model.
        We can get some ideas with preliminary plane analysis but to prove them
we need to compute accurate models.




        1.5 hours spent.



Best regards,
        Alex








On 16.09.2018 19:24, Mark Arokiaraj wrote:
> Dear Alex,
> I am sending you the details of coil placement. You can change positions
> if required.
> In 3D setting we can place about 6 coils with angulations and 4 extra
> coils also In a nearby locations to focus on the point of intersection
> at 10 cm.
> However, it is not required as we are already getting good results.
> Heat analysis may be required as these coils tend to generate heat int
> eh surrounding area or tissues which we can perform later I guess.
>
> with regards,
> Mark